Question

full angle theta formulae ​

Answer 1

Answer:

The formula is similar to the Pythagoras Theorem (a^2 + b^2 = c^2) and states c^2 = a^2 + b^2 - 2ab*cos(C). But for purposes of finding theta, it is easier read as cos(C) = (a^2 + b^2 - c^2)/2ab.